// Obsługa zapisywania pomiarów
function kf_save_measurement_ajax() {
    check_ajax_referer('kf_progress_nonce', 'nonce');
    
    if (!is_user_logged_in()) {
        wp_send_json_error('Musisz być zalogowany, aby zapisać pomiary.');
        return;
    }
    
    // Pobierz dane z formularza
    $user_id = get_current_user_id();
    $date = sanitize_text_field($_POST['date']);
    $weight = floatval($_POST['weight']);
    $waist = isset($_POST['waist']) && $_POST['waist'] ? floatval($_POST['waist']) : null;
    $hips = isset($_POST['hips']) && $_POST['hips'] ? floatval($_POST['hips']) : null;
    $arm = isset($_POST['arm']) && $_POST['arm'] ? floatval($_POST['arm']) : null;
    $thigh = isset($_POST['thigh']) && $_POST['thigh'] ? floatval($_POST['thigh']) : null;
    $body_fat = isset($_POST['body_fat']) && $_POST['body_fat'] ? floatval($_POST['body_fat']) : null;
    $notes = isset($_POST['notes']) ? sanitize_textarea_field($_POST['notes']) : '';
    
    // Walidacja
    if ($weight <= 0) {
        wp_send_json_error('Waga musi być większa od zera.');
        return;
    }
    
    // Sprawdź, czy istnieje już pomiar z tą datą
    global $wpdb;
    $table_name = $wpdb->prefix . 'kf_measurements';
    
    $existing = $wpdb->get_var($wpdb->prepare(
        "SELECT id FROM $table_name WHERE user_id = %d AND date = %s",
        $user_id, $date
    ));
    
    if ($existing) {
        wp_send_json_error('Pomiar z tą datą już istnieje. Edytuj istniejący pomiar zamiast dodawać nowy.');
        return;
    }
    
    // Zapisz pomiar do bazy danych
    $result = $wpdb->insert(
        $table_name,
        array(
            'user_id' => $user_id,
            'date' => $date,
            'weight' => $weight,
            'waist' => $waist,
            'hips' => $hips,
            'arm' => $arm,
            'thigh' => $thigh,
            'body_fat' => $body_fat,
            'notes' => $notes,
            'created_at' => current_time('mysql')
        ),
        array('%d', '%s', '%f', '%f', '%f', '%f', '%f', '%f', '%s', '%s')
    );
    
    if ($result === false) {
        wp_send_json_error('Wystąpił błąd podczas zapisywania pomiaru: ' . $wpdb->last_error);
        return;
    }
    
    wp_send_json_success(array(
        'message' => 'Pomiar został pomyślnie zapisany.',
        'id' => $wpdb->insert_id
    ));
}
add_action('wp_ajax_kf_save_measurement', 'kf_save_measurement_ajax');

// Obsługa pobierania pomiarów
function kf_get_measurements_ajax() {
    check_ajax_referer('kf_progress_nonce', 'nonce');
    
    if (!is_user_logged_in()) {
        wp_send_json_error('Musisz być zalogowany, aby zobaczyć pomiary.');
        return;
    }
    
    global $wpdb;
    $table_name = $wpdb->prefix . 'kf_measurements';
    $user_id = get_current_user_id();
    
    $measurements = $wpdb->get_results($wpdb->prepare(
        "SELECT * FROM $table_name WHERE user_id = %d ORDER BY date ASC",
        $user_id
    ));
    
    wp_send_json_success($measurements);
}
add_action('wp_ajax_kf_get_measurements', 'kf_get_measurements_ajax');<br />
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